678225 has 12 divisors (see below), whose sum is σ = 1121456. Its totient is φ = 361680.

The previous prime is 678221. The next prime is 678229. The reversal of 678225 is 522876.

It is an interprime number because it is at equal distance from previous prime (678221) and next prime (678229).

It is not a de Polignac number, because 678225 - 2² = 678221 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 678192 and 678201.

It is not an unprimeable number, because it can be changed into a prime (678221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4447 + ... + 4596.

2⁶⁷⁸²²⁵ is an apocalyptic number.

It is an amenable number.

678225 is a deficient number, since it is larger than the sum of its proper divisors (443231).

678225 is a wasteful number, since it uses less digits than its factorization.

678225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9056 (or 9051 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 678225 is about 823.5441700358. The cubic root of 678225 is about 87.8600133147.

It can be divided in two parts, 678 and 225, that added together give a triangular number (903 = T₄₂).

The spelling of 678225 in words is "six hundred seventy-eight thousand, two hundred twenty-five".